I just bought a 1999 Ducati 996 with Carbon Termignoni's and a Ducati Performance Chip installed. The problem is at 4000rpm and below the bike runs very rough, the throttle feels jerky.
Any ideas on what I can do to fix this ? Thanks in advance.

Here are a few clues :

- Check spark plugs condition, on my bike had the same symptoms you mentioned and it was due to one bad spark plug on horizontal cylinder.

- Throttle Body sync may have to be performed : quite easy to do if you have vacuum gauges.

- If the above does not work for you, you may want to check the CO : has to be between 3 and 6 % for proper running (NOT for environmental concern though)

- Don't know if you have a lighter than stock flywheel, if thats the case, idle is always a bit rough.

- Last solution, but wait for other members feedbacks on this, I heard the dual injector config coupled with the 1.6M computer was far from ideal. Check this for more info :

http://www.bcmducati.com/article.cfm?id=85&type=18

Maybe other members can confirm some of my thoughts.

Alex.

Thanks for the reply......I'll check the plugs and balance. I'm not sure what you mean by........
"If the above does not work for you, you may want to check the CO : has to be between 3 and 6 % for proper running (NOT for environmental concern though)"

I meant check the carbon monoxyde proportion out of your exhaust cans. You need a gastester to do that, and there is a trimmer inside the ECU to make the bike richer or leaner. Like I said somewhere between 3 and 6 % is what you're looking for.

Best,

Alex.

Just adjusted the trimmer inside the ECU and the bike is alot better.....Thanks Chiarelloa

Just wondered what steps are neened to do the trimmer adjustment on a 1998 916?